Of how many parts does the true conversion of man consist?

Heidelberg Catechism (extended)

The Catechism
Method of Instruction in the Christian Religion
As the Same is Taught in the Reformed Churches and Schools

(with the Scripture references written out)

Note. This Catechism is fully based on the Scriptures. The references to Scripture are indicated in parentheses with a letter. For example, the letter (a) points to the texts (a) placed after the answer.

33. Lord's Day 

Q. 88. Of how many parts does the true conversion of man consist? 

A. Of two parts; of the mortification of the old, and the quickening of the new man. (a)

(a) Rom.6:1 What shall we say then? Shall we continue in sin, that grace may abound? Rom.6:4 Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life. Rom.6:5 For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection: Rom.6:6 Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin. Eph.4:22 That ye put off concerning the former conversation the old man, which is corrupt according to the deceitful lusts; Eph.4:23 And be renewed in the spirit of your mind; Eph.4:24 And that ye put on the new man, which after God is created in righteousness and true holiness. Col.3:5 Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry: Col.3:6 For which things' sake the wrath of God cometh on the children of disobedience: Col.3:7 In the which ye also walked some time, when ye lived in them. Col.3:8 But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth. Col.3:9 Lie not one to another, seeing that ye have put off the old man with his deeds; Col.3:10 And have put on the new man, which is renewed in knowledge after the image of him that created him: 1 Cor.5:7 Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us: 2 Cor.7:10 For godly sorrow worketh repentance to salvation not to be repented of: but the sorrow of the world worketh death. 

Q. 89. What is the mortification of the old man? 

A. It is a sincere sorrow of heart, that we have provoked God by our sins; and more and more to hate and flee from them. (a) 

(a) Rom.8:13 For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live. Joel 2:13 And rend your heart, and not your garments, and turn unto the LORD your God: for he is gracious and merciful, slow to anger, and of great kindness, and repenteth him of the evil. Hos.6:1 Come, and let us return unto the LORD: for he hath torn, and he will heal us; he hath smitten, and he will bind us up. 

Q. 90. What is the quickening of the new man? 

A. It is a sincere joy of heart in God, through Christ, (a) and with love and delight to live according to the will of God in all good works. (b) 

(a) Rom.5:1 Therefore being justified by faith, we have peace with God through our Lord Jesus Christ: Rom.14:17 For the kingdom of God is not meat and drink; but righteousness, and peace, and joy in the Holy Ghost. Isa.57:15 For thus saith the high and lofty One that inhabiteth eternity, whose name is Holy; I dwell in the high and holy place, with him also that is of a contrite and humble spirit, to revive the spirit of the humble, and to revive the heart of the contrite ones. 

(b) Rom.6:10 For in that he died, he died unto sin once: but in that he liveth, he liveth unto God. Rom.6:11 Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord. Gal.2:20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me. 

Q. 91. But what are good works? 

A. Only those which proceed from a true faith, (a) are performed according to the law of God, (b) and to his glory; (c) and not such as are founded on our imaginations, or the institutions of men. (d) 

(a) Rom.14:23 And he that doubteth is damned if he eat, because he eateth not of faith: for whatsoever is not of faith is sin. 

(b) Lev.18:4 Ye shall do my judgments, and keep mine ordinances, to walk therein: I am the LORD your God. 1 Sam.15:22 And Samuel said, Hath the LORD as great delight in burnt offerings and sacrifices, as in obeying the voice of the LORD? Behold, to obey is better than sacrifice, and to hearken than the fat of rams. Eph.2:10 For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them. 

(c) 1 Cor.10:31 Whether therefore ye eat, or drink, or whatsoever ye do, do all to the glory of God. 

(d) Deut.12:32 What thing soever I command you, observe to do it: thou shalt not add thereto, nor diminish from it. Ezek.20:18 But I said unto their children in the wilderness, Walk ye not in the statutes of your fathers, neither observe their judgments, nor defile yourselves with their idols: Ezek.20:19 I am the LORD your God; walk in my statutes, and keep my judgments, and do them; Isa.29:13 Wherefore the Lord said, Forasmuch as this people draw near me with their mouth, and with their lips do honour me, but have removed their heart far from me, and their fear toward me is taught by the precept of men: Matt.15:7 Ye hypocrites, well did Esaias prophesy of you, saying, Matt.15:8 This people draweth nigh unto me with their mouth, and honoureth me with their lips; but their heart is far from me. Matt.15:9 But in vain they do worship me, teaching for doctrines the commandments of men.

Source: http://www.ccel.org/creeds/heidelberg-cat-ext.txt